Long story short, I realized I wasn't getting into a "flow-state" often enough and guess where you can get an easy fix of that? First-person shooters.. (for me anyway). I don't have 3+ hour-long sessions or anything, maybe just a round or two and it's like that first cup of coffee in the morning.
This isn't saying the USSR or the Bolsheviks weren't horrible, but one must put their crimes against humanity in the proper context and not turn them into super inhuman villains as much as we did with the Nazis (they too were horrible, but sadly they were very much a product of the mainstream values of their time).
Plus, the claim that allowing for social democratic policies like UBI, IP law reform, and the like to come to fruition isn't going to create another Red Terror. If anything, it's the most conservative thing you can do (see German Empire and the institution of Social Insurance by Otto von Bismarck) since it retains capitalism but tames its worse aspects for a time. This is why I roll my eyes at folks like Thiel since they rarely have anything that would be a viable alternative than status quo and lying about how bad things are for many people today. And I say this as someone who's far left of many folks being a Mutualist and an anarchist.
To understand Thiel's position, you have to broaden your idea of harm past immediate harm to a single group of people.
While I'm sure Thiel has personal economic concerns, his stated primary moral concern is preventing wealth redistribution, socialism, and the mass-scale violence that those programs have caused in the past. You can choose to believe him as to whether this is his true motivation or not, but you asked for an explanation of this worldview and that's what he's stuck with over 10+ years now.
While you might be more worried about Nazis, Thiel is more worried about things like 1905 and 1917 Russian revolutions, the ensuing Red Terror, and mass starvation/poverty. About 20M people died in Russia during this time, mostly from starvation but up to 200,000 dead by being executed by the state for having the wrong political beliefs. And many more during the various violent uprisings and civil wars.
Some of you reading this are going to huff and just disregard it, but for Thiel, preventing potential massive tragedy in the future is likely worth a tradeoff of some people being "harmed" now.
Edit: the number of replies to your comment which basically amount to "he just doesn't care about others/he's rich so he's evil" indicate that even the Hacker News audience is not immune to believing in lazy explanations and supernatural forces. Google "The Myth of Pure Evil" for more on this.
https://kotaku.com/dungeons-and-dragons-dnd-fifth-edition-on...